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“Facebook was embroiled in controversy over its data-collection practices. Mr. Cook piled on in a national television interview, saying his own company would never have found itself in such a jam. Mr. Zuckerberg shot back that Mr. Cook’s comments were “extremely glib” and “not at all aligned with the truth.”In private, Mr. Zuckerberg was even harsher. “We need to inflict pain,” he told his team, for treating the company so poorly, according to people familiar with the exchange.It wasn’t the first time—or the last—that Mr. Cook’s comments and actions would leave Mr. Zuckerberg seething and, at times, plotting to get back at Apple. The escalation of grievances erupted late last month in a rare public tit-for-tat between the two tech giants that laid bare the simmering animosity between their leaders, who exchanged jabs about privacy, app-tracking tools and, ultimately, their dueling visions about the future of the internet.”

Source : Facebook Meets Apple in Clash of the Tech Titans—‘We Need to Inflict Pain’ – WSJ